Standard Linux file permissions are satisfactory for most situations, but they have limitations. Permissions restricting access to a file are limited to the file owner, membership of a single group, or everyone else. It may not be appropriate for the process (a running program) to be a member of the file’s owning group, and even less desirable to grant permissions to everyone. ACLs allow fine-grained permissions to be allocated to a file. Named users or named groups, as well as users and group [...]